René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"concurrency examples","articleBody":"hi.\r\nso i know that you probably know this\r\nbut if there will be a 3rd edition, exapmles 19-13 and 19-12 (and other examples in chapter 19) need a rework.\r\ne.g the mentioned examples actually fail to prove the point of multiprocessing  being good for cpu bound work since the prime number example is done in less than a second\r\nthe perf_countr() actually shows `0.00`\r\nand 19-13 actually takes longer due to multiprocessing overhead\r\n\r\nbelow is the result of running them on python 3.12.2 on a not very new xeon cpu with `perf_counter()`\r\n```\r\npython sequential.py \r\n\r\nChecking 20 numbers sequentially:\r\n               2  P  0.000001s\r\n 142702110479723  P  0.000002s\r\n 299593572317531  P  0.000001s\r\n3333333333333301  P  0.000001s\r\n3333333333333333  P  0.000001s\r\n3333335652092209  P  0.000001s\r\n4444444444444423  P  0.000001s\r\n4444444444444444     0.000001s\r\n4444444488888889  P  0.000001s\r\n5555553133149889  P  0.000001s\r\n5555555555555503  P  0.000001s\r\n5555555555555555  P  0.000001s\r\n6666666666666666     0.000001s\r\n6666666666666719  P  0.000001s\r\n6666667141414921  P  0.000001s\r\n7777777536340681  P  0.000001s\r\n7777777777777753  P  0.000001s\r\n7777777777777777  P  0.000001s\r\n9999999999999917  P  0.000001s\r\n9999999999999999  P  0.000001s\r\nTotal time: 0.00s\r\n```\r\n```\r\npython procs.py \r\n\r\nCheking 20 numbers with 16 processes:\r\n               2  P  0.000035s\r\n 142702110479723  P  0.000003s\r\n 299593572317531  P  0.000002s\r\n3333333333333301  P  0.000001s\r\n3333333333333333  P  0.000001s\r\n3333335652092209  P  0.000001s\r\n4444444444444423  P  0.000001s\r\n4444444444444444     0.000001s\r\n4444444488888889  P  0.000001s\r\n5555555555555503  P  0.000001s\r\n5555555555555555  P  0.000001s\r\n6666666666666666     0.000001s\r\n6666666666666719  P  0.000001s\r\n6666667141414921  P  0.000001s\r\n7777777536340681  P  0.000001s\r\n7777777777777753  P  0.000001s\r\n7777777777777777  P  0.000001s\r\n9999999999999917  P  0.000001s\r\n9999999999999999  P  0.000001s\r\n5555553133149889  P  0.000033s\r\n20 checks in 0.02s\r\n```\r\n\r\nand this is the result using `perf_counter_ns()`\r\n\r\n```\r\npython sequential.py \r\n\r\nChecking 20 numbers sequentially:\r\n               2  P 487.000000ns\r\n 142702110479723  P 1047.000000ns\r\n 299593572317531  P 500.000000ns\r\n3333333333333301  P 320.000000ns\r\n3333333333333333  P 295.000000ns\r\n3333335652092209  P 279.000000ns\r\n4444444444444423  P 214.000000ns\r\n4444444444444444    296.000000ns\r\n4444444488888889  P 215.000000ns\r\n5555553133149889  P 200.000000ns\r\n5555555555555503  P 222.000000ns\r\n5555555555555555  P 247.000000ns\r\n6666666666666666    290.000000ns\r\n6666666666666719  P 196.000000ns\r\n6666667141414921  P 227.000000ns\r\n7777777536340681  P 202.000000ns\r\n7777777777777753  P 202.000000ns\r\n7777777777777777  P 202.000000ns\r\n9999999999999917  P 202.000000ns\r\n9999999999999999  P 202.000000ns\r\nTotal time: 118353.00ns\r\n```\r\n```\r\npython procs.py \r\n\r\nCheking 20 numbers with 16 processes:\r\n               2  P 13804.000000ns\r\n 142702110479723  P 2860.000000ns\r\n 299593572317531  P 1762.000000ns\r\n3333333333333301  P 1324.000000ns\r\n3333333333333333  P 1270.000000ns\r\n3333335652092209  P 1073.000000ns\r\n4444444444444423  P 794.000000ns\r\n4444444444444444    1200.000000ns\r\n4444444488888889  P 810.000000ns\r\n5555553133149889  P 890.000000ns\r\n5555555555555503  P 753.000000ns\r\n5555555555555555  P 995.000000ns\r\n6666666666666666    925.000000ns\r\n6666666666666719  P 813.000000ns\r\n6666667141414921  P 678.000000ns\r\n7777777536340681  P 763.000000ns\r\n7777777777777753  P 703.000000ns\r\n9999999999999917  P 941.000000ns\r\n9999999999999999  P 740.000000ns\r\n7777777777777777  P 26330.000000ns\r\n20 checks in 18213477.00ns\r\n```","author":{"url":"https://github.com/amirreza8002","@type":"Person","name":"amirreza8002"},"datePublished":"2024-04-10T22:48:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/43/example-code-2e/issues/43"}